Date: Thu, 14 Aug 1997 08:31:14 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: xiyuan@npc.haplink.co.cn (xiyuan qian) Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Is there any configuration error? Message-ID: <199708141531.IAA17915@GndRsh.aac.dev.com> In-Reply-To: <199708141537.PAA04940@npc.haplink.co.cn> from xiyuan qian at "Aug 14, 97 03:37:17 pm"
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> Hi, one of my customer obtained 8 IP address from his ISP, they are > 202.96.215.120--202.96.215.127. He assign 126 to his router running > igrp protocol, 121,123 to his NT server, 124 to his workstation running > Windows95. All work well but 124 can not ping out(Request time out). > If changing its IP address to 122, it will work. I tried 125, failed > too. Where is the problem? What is the netmask on these 8 IP addresses? If it is really a 3 bit block it should be 0xfffffff8, but from the above it looks as if it is really 2 2 bit blocks with a netmask of 0xfffffffc, which makes .120 and .124 the network IP address and .123 and .127 the network broadcast addresses. Check your netmasks, and the ISP's idea of the netmasks, oh, and for the Hex impared windows world, 0xfffffff8 = 255.255.255.248 and 0xfffffffc = 255.255.255.252. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation, Inc. Reliable computers for FreeBSD
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